Fire, Fury, Faith by N.D. Jones

Issa, tribal chieftain and warrior, dies trying to protect his family and tribesmen from slave traders but is given a second chance at life as an angel. Having lost his home, daughters, and life by forces beyond his control, Issa, a Guardian Angel for four centuries, has yet to come to terms with this “failure.” So when a rogue demon attacks and almost kills his wife, Serwa, Issa goes on the hunt.
Serwa knows the pain of loss, the burn of fire, the heat of love. She is a Healer Angel, bound to help, to heal, to protect. And the person she wants most to heal is Issa, her husband, her soul mate, her warrior. But what is a woman to do when a husband’s guilt and fury challenge the very foundation of their marriage?